I often think of science covering the set of things we're reasonably sure we know because we have evidence for it. Everything else, i.e. all of the things we don't know or possibly can never know are covered by "faith" or in other parlance, making stuff up and believing what you would like to be true. Religion then, becomes the job of convincing (usually by threat, violence or indoctrination) other people to believe the same made-up stuff as you simply because Human beings (social apes) have evolved to hate being outliers. Then you have blind-faith, which is believing stuff despite evidence to the contrary, or in other words the set of people that stick their fingers in their ears and shout "la la la".. which, disappointingly, is most people on the planet.